Hand-sanding machine



E. I. DODDS ET AL HAND SANDING MACHINE mug Jan 1927 Dec. 3, 4929.

[:Zhan Dodds than Dodds J/r JET/E lid 'lf' l STATES TNT F IlTIIAN I. DODDS, OF CENTRAL VALLEY, AND ETELMH' I. DODDS, JR; OF NEW YORK, N. Y.; SAID ETHAN I. 13013115, JlEt-., AESSIGNOR 'IU SAID ETHJf-IN I. DOIJDS, SB.

HAND-SANDING MACHINE Application filed January 5, 1927. Flerial No. 159,083.

This invention relates to a sanding machine adapted for polishing or finishing parts of vehicles or furniture or the like and concerns itself with a light portable machine that can be readily handled by a single person and applied to the work.

The invention comprises the novel structure and combination of parts hereinafter described and more particularly pointed out and defined in the appended claims.

In the accompanying drawings which illustrate a preferred form of this invention and in which similar reference numerals refer to similar features in the different views.

Figure 1 is an elevational view of the sanding machine involving this invention.

Figure 2 is a front and elevational view of the machine.

Figure 3 is a rear and elevational view of the machine.

Figures 4: and 5 are fragmentary elevational views of modified part.

Figure 6 is an enlarged sectional view upon the line VIVI of Figure 2.

Figure 7 is an enlarged sectional view upon the line VII-V II of Figure 1.

As illustrative of this invention, there is shown a support 1 which is in the form of a casing having a handle 2 by means of which it may be held by the operator and applied to its work. The casing is provided with a base 3 over which an abradant strap or flexible member at is adapted to vibrate. Suitable power means within the casing is opera tivcly connected with one end of the strap for imparting longitudinal movement thereto. The other end of said strap is preferably yieldingly anchored to some part of the ma chine.

In the present embodiment of this invention, the power means is shown as a shaft 5 which may constitute a motor shaft, the motor being mounted within the casing, and the connection between the strap 4 and the power means may consist of an eccentric connection, which in the case of a high speed motor may involve reduction gearing. Thus a small pinion 6 secured upon the motor shaft meshes with a larger gear 7 mounted upon a lug 8 rising from the base 3, said gear 7 having a wrist pin 8 which is eccentrioa-lly mounted and upon which a collar or hub 9 is rotatably secured, said collar having a depending portion 10 upon which one end of the strap is secured.

In case of a low speed motor, the motor shaft may be provided with an eccentric 11 (Figure l.) surrounded by an eccentric strap 12 to which the end of the abradant strap may be connected, or a collar 12 (Figure 5) maybe formed upon the motor shaft and provided with an eccentrically mounted wrist pin 13 to which one end of the strap may be connected by means of a device similar to the collar 9 shown in Figure 1.

The strap a is trained under the base 3 which may be provided with rolling elements 14: at its ends for guiding the strap.

One way of yieldingly anchoring the rear end of the abradant strap is shown in Figures 1 and 8. In referring to said figures, it will be noted that the rear end of the strap is connected to a. plate 15 having a headed shank 16 which extent s through the base of a depending lug or 11 anger 1.7 depending from a collar 18 upon a pintle 19 extending from the ass ing. A strong spring 20 is confined between the base of the hanger 17 and the head of the shank 16 for returning the strap to the right as the wrist pin 8 travels downward from its highest point.

The bottom of the strap t carries a strip of sand or emery paper which acts upon the parts to be finished or polished as the motor and spring 20 cause a reciprocating or vibratory movement of the strap 4 which is supported against the bottom of the base 3. It will be obvious that the rotation of the gear 7 will draw the strap to the left as the wrist pin 8 ascends, and that the spring 20 will draw the strap to the right as the wrist pin 8 descends. The strap 8 will always be held taut by the spring 20.

We are aware that many changes may be made and numerous details of construction may be varied through a wide range without departing from the principals of this invention and we therefore do not purpose limiting the patent granted hereon otherwise than necessitated by the prior art.

We claim as our invention:

1. In a sanding machine, a casing having a handle, a motor in said casing, a gear driven by the motor, a Wrist pin eccentrically mounted on said gear, a flexible member conneoted at one end to said Wrist pin and trained under said casing, resilient means connecting the other end of said flexible member to said casing, and abrasive means carried by said flexible member.

2. In a sanding machine, a casing adapted for manual handling and having a base, power means carried by said casing, a flexible abrasive member extending over said base for vibratory movement, a resilient connection on said casing for anchoring one end of said flexible member and a connection between said flexible member and power means for operating the former.

In testimonywhereof We have hereunto subscribed our names.

ETHAN I. DODDS. ETHAN I. DODDS, JR. 

